The average age of 30 boys in a class is 15 years. If we include the age of two teachers the average age increases by 1. Find the sum of ages of the two teachers.

62 years

Total age of boys in a class = 30 x 15 = 450

If we include the age of 2 teachers then average becomes = 16, so we can say the total age including teachers in the class is 32 x 16 = 512

Thus, the sum of the ages of the two teachers = 512 - 450 = 62 years